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Introduction to SQL

Introduction to SQL
Indexes can usually be created for both primary and secondary keys.

False
True

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Introduction to SQL
Most companies keep at least two versions of any database they are using.

False
True

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Introduction to SQL
Which command undo all the updates performed by the SQL in the transaction?

COMMIT
DELETE
TRUNCATE
ROLLBACK

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Introduction to SQL
The SQL WHERE clause:

limits the row data are returned.
Neither A nor B are correct.
limits the column data that are returned.
Both A and B are correct.

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Introduction to SQL
To sort the results of a query use:

ORDER BY.
GROUP BY.
SORT BY.
None of these

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Introduction to SQL
SELECT DISTINCT is used if a user wishes to see duplicate columns in a query.

False
True

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